Which of these conditions would stimulate the chemoreceptor reflex?
A. increased oxygen content of the blood
B. increased carbon dioxide content of the blood
C. decreased pH of the blood
D. All of these would stimulate the chemoreceptor reflex.
E. Of these, only increased carbon dioxide content of the blood and decreased pH of the blood would . stimulate the chemoreceptor reflex.
Ans: E. Of these, only increased carbon dioxide content of the blood and decreased pH of the blood would . stimulate the chemoreceptor reflex.
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Which of the following statements regarding the determination of stimulus intensity is true?
A. The only means of detecting intensity changes is through recruitment of greater numbers of sensory units. B. The duration of receptor potentials decreases with increasing stimulus intensity. C. The frequency of action potentials increases with increasing stimulus intensity. D. Stronger intensity stimuli cause rapid adaptation, while weaker stimuli cause slower adaptation. E. The amplitude of action potentials increases with increasing stimulus intensity.
Which of the following statements regarding lipid digestion and absorption is TRUE?
A. The presence of fatty acids in the stomach stimulates the secretion of secretin, which inhibits motility of the large intestine. B. The presence of fatty acids in the duodenum stimulates the secretion of CCK, which in turn stimulates secretion of pancreatic enzymes. C. The presence of fatty acids in the duodenum stimulates the secretion of secretin, which in turn stimulates contraction of the gallbladder. D. The presence of fatty acids in the duodenum stimulates the secretion of gastrin, which in turn stimulates bile synthesis in the gallbladder. E. The presence of fatty acids in the duodenum stimulates emptying of the stomach.
Which of the following statements is true regarding the gray matter of the cerebrum?
A. It is located only in the cerebral cortex. B. It consists mainly of nerve cell bodies and myelinated fibers. C. It is found both in the superficial cortex and in deeper basal nuclei. D. It consists mainly of nerve cell bodies and unmyelinated fibers and is found both in the superficial cortex and in the substantia nigra. E. It is found in the cerebral cortex of the frontal, parietal, and occipital lobes but does not cover the entire temporal lobe.
The tube that drains bile from the gallbladder is the:
a. common bile duct b. cystic duct c. hepatic duct d. major duodenal papillae